A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

"The Labor Party has lost a giant." - Federal Opposition Leader Bill Shorten

"All Prime Ministers capture the attention of the Australian people. Not all Prime Ministers capture their imagination. Gough Whitlam was able to do that." - Malcolm Turnbull

"He was not able to run a competent government - I don't think Gough should really be remembered as a great prime minister." - West Australian Premier Colin Barnett.

"I was only eight and my mother was ironing (on the day of the dismissal). I was watching Adventure Island, and my mother was crying. I'll let you in on a secret, she wasn't crying out of sadness. She was crying out of joy." - Education Minister Christopher Pyne.

"Mr Whitlam made us a progressive nation and put us on the global map." - Greens leader Christine Milne

"He was a man of integrity who achieved a lot for our nation. He must never be forgotten by Australians." - PUP leader Clive Palmer

"He damaged the economy through the absence of any prime-ministerial control." - conservative commentator Alan Jones.

"I express the hope that one of my legacies will be access for men and women, workers and employers, to a good education in all regions of our continent." - Gough Whitlam on his own legacy (at his 90th birthday).